def ask_ok(prompt,retries=4,reminder='Please try again!'):
    while True:
        ok = input(prompt)
        if ok in ('y','ye','yes'):
        # if ok in 'yes':
            return True
        if ok in ('n','no','nop','nope'):
            return False
        retries = retries - 1
        if retries < 0:
            raise ValueError('invalid user response')
        print(reminder)


ask_ok('Do you really want to quit?')